LG LRBN2251 Series Service Manual page 15

M General Control of Refrigerating Cycle
NO. ITEMS UNIT
Pipe and Min.
1
piping system
opening time
Welding Nitrogen
2
pressure
N sealed Confirm
3
2
parts N leak
2
Refrige- Evacuation Min.
4
ration time
Cycle
Torr
Vacuum
degree
EA
Vacuum
Vacuum EA
piping
Pipe EA
coupler
Outlet
(Socket)
Plug
Refrigerant EA
5
weighing
Drier
6
replacement
Leak check
7
STANDARDS
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N pressure:
2
0.1~0.2 kg/cm )
2
Confirm the sound of
pressure relief when
removing the rubber cap.
Sound: usable
No sound: not usable
More than 40 minutes
Below 0.03 (ref)
High and low pressure sides
are evacuated at the same
time for models above 200
l.
Use R-134a manifold
exclusively.
Use R-134a manifold
exclusively.
R-134a manifold exclusively.
R-134a manifold exclusively.
Use R-134a exclusively.
Weighing allowance: ±5g
Note: Winter: -5g
Summer: +5g
- Use R-134a exclusively for
R-134a refrigerator.
- Replace drier whenever repairing
refrigerator cycle piping.
- Do not use soapy water for
check. It may be sucked
into the pipe by a vacuum.
- 15 -
PURPOSES
To protect The opening time should be reduced
moisture to a half of the standards during rain
penetration. and rainy seasons (the penetration of
water into the pipe is dangerous).
To protect oxide - Refer to repair note in each part.
scale formation. - R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding.
- Do not apply force to pipes before and
after welding to protect pipe from cracking.
To protect - In case of evaporator parts, if it doesn't
moisture make sound when removing rubber
penetration. cap, blow dry air or N
than 1 min. and than use the parts.
To remove moisture.
Note: Only applicable to the model
equipped with reverse flow
protect plate.
Vacuum efficiency can be improved
by operating compressor during
evacuation.
To protect mixing The rubber pipes for R-12 refrigerant
of mineral and will be melted when they are used for
ester oils. R-134a refrigerant (causes of leak.)
To protect R-12
refrigerant mixing.
To protect R-12
refrigerant mixing.
To protect R-12
refrigerant mixing.
Do not mix with - Do not weigh the refrigerant at too
R-12 refrigerant. hot or too cold an area.
(77°F [25°C] is adequate.)
- Make Copper charging canister
(Device filling refrigerant)
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (bushing)
during welding.
To remove the
moisture from
pipe inside.
Defect in - Check for an oil leak at the refrigerant
refrigerant leak leak area. Use an electronic leak
area. detector if an oil leak is not found.
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Practice many times before using this
type of detector to avoid false readings.
REMARKS
gas for more
2